Beam Load Calculator
Bending moment and deflection for a beam.
Enter your values
Results update instantly as you type — no submit needed.
Results
- Max bending moment
- 14.06 kNm
- Max shear
- 11.25 kN
- Max deflection
- 2.15 mm
- Span/deflection ratio
- L/2,321
Quick answer
A simply supported beam under uniform load has maximum moment at midspan equal to wL²/8.
M = wL² ÷ 8
How to use the Beam Load Calculator
- 1Enter the uniform load per metre.
- 2Enter the clear span.
- 3Enter the beam's E and I values from the section table.
Frequently asked questions
What deflection is acceptable?
L/250 for general use, L/360 under plaster ceilings.
Is this a design tool?
It is an estimate — structural work needs a qualified engineer.